THIS^^^. There's no need to malign the Church, her indefectibility, and the protection of the Holy Spirit over the true Catholic Church. It really is this simple. We have a bunch of Catholics here who think it's OK to say that the Catholic Church became a whore ... rather than identify the real culprits, illegitimate enemy infiltrators.
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Yeah, I see your point of view, Ladislaus, on the Siri thesis in general, in how it could provide an explanation for the crisis. If it's true, it could, but something like that should not be accepted without proof, which we don't seem to have.
I have a major problem, though, with the idea that Cardinal Siri continued to be pope until his death. (This is leaving aside any question of his orthodoxy or acceptance of Vatican 2; let's assume for the sake of argument that he remained orthodox). Let's suppose by your theory that he may have mistakenly thought he had resigned, when his resignation had actually been invalid because of duress. He would still have relinquished the papacy, if he had it to begin with, by going back to Genoa and continuing to serve as a cardinal and recognizing someone else as pope and never claiming to be pope. All of those things constitute an implicit resignation, since he made it clear by his actions that he didn't intend to function as pope.
This should be common sense, but if you're not convinced, it's basically laid out in canon law. In the 1917 code, the famous canon 188 says that
Any office becomes vacant upon the fact and without any declaration by tacit resignation recognized by the law itself if a cleric:
This is familiar to most of us because of number 4, which is if he "publicly defects from the Catholic faith", but there are two other sections in that code that would preclude your theory on the declining years of Cardinal Siri. First there's
Within the useful time established by law or, legal provision lacking, as determined by the Ordinary, fails to take possession of the office;
So, if someone doesn't take possession of an office within the time established by law, that's considered a tacit resignation. Again, this is just common sense, that an office must be exercised, and if someone is appointed to an office and never claims possession of it, then he is considered to be resigning that office. Now, what constitutes taking possession of the papacy could be debatable, but it should be obviously that going back to Genoa and wearing red and telling people to call you "Cardinal So-and-So" and recognizing someone else as pope for the rest of your life cannot be considered taking possession of the office of the papacy.
The other section that is relevant here is:
Accepts another ecclesiastical office incompatible with the prior, and has obtained peaceful possession of [the other office]
This is another common-sense regulation. Obviously being cardinal of Genoa is incompatible with being pope, so if someone chooses to be cardinal of Genoa instead of being pope, regardless of whether he understood that he was or wasn't pope, or understood that this would be a resignation of the papacy, or whatever else, this is an automatic resignation of the papacy.